"How to apply a load via a remote pilot point (similar to Ansys) in Code_Aster?

berchiche

Hello everyone,
I am currently conducting a linear mechanics study using Code_Aster, and I would like to apply a load through a pilot point (remote point), similar to what is done in Ansys.
The load would of course be transmitted to the entire structure via this point.
However, I haven’t been able to find an equivalent feature in Code_Aster.
Do you know of any methods or test cases that could help me model this type of loading in Code_Aster?
Thank you very much for your help!

Sound_Spinning

berchiche
Maybe check this example: SSLP113 — RBE3

In your case you leave the ref node on coupling _RBE3 for the load, instead of attached to another element, but same logic.

jacob

LIAISON_SOLIDE, LIAISON_RBE3

berchiche

jacob Thank you

berchiche

Sound_Spinning Thank you , I will check this

berchiche

Hello,
I need to create a pilot node in order to apply the RBE3 relation. However, this node is located in the middle of my structure. When I create it using the "Node" feature in the mesh module, it appears in the mesh tree but is considered an orphan node. As a result, I’m unable to apply any load to it.
Do you have any suggestions on how I could create this node so that it is properly connected to the rest of the structure and not treated as orphaned?
Thank you in advance for your help.

jeanpierreaubry

try something like this
and maybe come back for more explanation

mesh0=LIRE_MAILLAGE( ......

#create a POI1 element on the orphan node so it is not free floating
mesh= CREA_MAILLAGE(
	MAILLAGE=mesh0,
	CREA_POI1=_F(NOM_GROUP_MA=('endrelrp', ),GROUP_MA=('endrelr' ),),
	INFO=1,
);

model=AFFE_MODELE(
	MAILLAGE=mesh,
	AFFE=(
		_F(GROUP_MA=('endrelrp',),PHENOMENE='MECANIQUE',MODELISATION='DIS_TR',),
	),
);

verylarge=1.0e12;
verysmall=0.0; #although excatly null may be playing with fire in some cases
elemcar=AFFE_CARA_ELEM(
	MODELE=model,
	DISCRET=(
		_F(
			GROUP_MA=('endrelrp',), CARA='K_TR_D_N',VALE=(verysmall,), #for all 6 values
			REPERE='GLOBAL',
		),
	),
);

[/code

berchiche

jeanpierreaubry
Hello, thank you for your help. When I do this, I can't apply a nodal force—the point no longer appears as a node.

jeanpierreaubry

berchiche
i see that may be a feature of Salome (which i never use) which has its way of handling groups in med file
try this after CREA_MAILLAGE

mesh=DEFI_GROUP(
	reuse =mesh,MAILLAGE=mesh,
    CREA_GROUP_NO=_F(TOUT_GROUP_MA='OUI',), #or only on the specific GROUP_MA
);

if it does not work post the .mess file here